Is it geologically active? How did it get so close to the sun? But, at least, its strange apparent motion is well understood. "There's nothing fancy about it," Daylan said. This story has been ...

That never changes. Mercury retrograde is when the closest planet to the sun, Mercury, is in apparent retrograde motion. This means that, from our perspective on Earth, it appears as if Mercury is ...

In astronomy circles the term is “apparent retrograde motion ... Venus rotates on its axis in retrograde motion to most other planets — the sun would rise there in the west and set in ...